Application of date palm trunk fibers as adsorbents for removal of Cd+2 ions from aqueous solutions

In this research raw date palm trunk fibers were used to adsorb cadmium ions from aqueous solutions. The date palm trunk fibers are considered as agricultural waste which is available in huge quantities in the Kingdom of Saudi Arabia. In order to assess the feasibility and the efficiency of using this as an adsorbent, a series of experiments were conducted in a batch adsorption method. The effects of the process variables such as fiber size, mixing rate, mixing time, temperature, solution pH and adsorbent dose on the adsorption capacity of date palm fibers were studied. The results obtained indicated that the adsorption capacity of Cd2+ increased from 29.06 to 51.1 mg/g as the particle size decreased from 875 to 100 μm. It was found that the adsorption capacity of Cd2+ decreased in the strong acidic medium and increased rapidly as the solution pH increased from 1.69 to 3.71. The adsorption capacity was observed to have an insignificant change on raising the temperature from 12 to 34 °C and increasing of mixing speed from 100 to 500 rpm. Also, one very important finding of this research is that the equilibrium time of the adsorption process is very short. The maximum adsorption capacity was obtained after 10 minutes.

We already know that the pH of water can have detrimental effect on human health, and can be affected by a number of different factors including: residue from volcanic vents, acid rain and global warming. But just how big of an effect can it have on delicate aquatic ecosystems?
A number of recent stories and headlines have indicated that the answer is, quite a lot. From fishing practices in Alaska, to dampened escape responses in black turban snails, acidic water is showing increasingly observable pressure on...

The production of zero-valent iron nanoparticles, using extracts from natural products, represents a green and environmentally friendly method. Synthesis of ‘green’ zero-valent nanoparticles (nZVI) using oak and mulberry leaf extracts (OL-nZVI and ML-nZVI) proved to be a promising approach for Ni(II) and Cu(II) removal from aqueous solutions. Characterization of the produced green nZVI materials had been conducted previously and confirmed the formation of nanosize zero-valent iron particles within the size range...

This study aims to explore the preparation and application of alum sludge (AS) and mud sludge (MS) from a drinking water treatment plant to remove methylene blue (MB) dye from aqueous solution. The sludge (MS and AS) was treated by chemical and physical activation to obtain new adsorbents. The adsorption experiments were carried out under different conditions of initial dye concentration (50–100 mg/L) adsorbent dosage (0.05–0.25 g), solution pH (3–9), temperature (20–60 °C) and contact time (20–90 min). Scanning...